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Add new macro QEMU_PACKED for packed C structures

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A packed struct needs different gcc attributes for compilations
with MinGW compilers because glib-2.0 adds compiler flag
-mms-bitfields which modifies the packing algorithm.

Attribute gcc_struct reverses the negative effects of -mms-bitfields.
QEMU_PACKED sets this attribute and must be used for any packed
struct which is affected by -mms-bitfields.

Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Stefan Weil 2011-08-31 12:38:00 +02:00 committed by Blue Swirl
parent a74cd8cc37
commit 0f7fdd3475
1 changed files with 6 additions and 0 deletions
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6
compiler.h
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@ -12,6 +12,12 @@
#define QEMU_WARN_UNUSED_RESULT
#endif
#if defined(_WIN32)
# define QEMU_PACKED __attribute__((gcc_struct, packed))
#else
# define QEMU_PACKED __attribute__((packed))
#endif
#define QEMU_BUILD_BUG_ON(x) \
typedef char qemu_build_bug_on__##__LINE__[(x)?-1:1];